New blue light technique could enable advances in understanding nanoscale technologies

Photo Credit: Courtesy of Brown University

With a new microscopy technique that uses blue light to measure electrons in semiconductors and other nanoscale materials, a team of Brown University researchers is opening a new realm of possibilities in the study of these critical components, which can help power devices like mobile phones and laptops.

The findings are a first in nanoscale imaging and provide a workaround to a longstanding problem that has greatly limited the study of key phenomena in a wide variety of materials that could one day lead to more energy-efficient semiconductors and electronics. The work was published in Light: Science & Applications.

“There is a lot of interest these days in studying materials with nanoscale resolution using optics,” said Daniel Mittleman, a professor in Brown’s School of Engineering and author of the paper describing the work. “As the wavelength gets shorter, this becomes a lot harder to implement. As a result, nobody had ever done it with blue light until now.”

Cannabis exposures in suspected suicide attempts are on the rise

Photo Credit: Jose Luis Sanchez Pereyra

Suspected suicidal cannabis exposures have increased 17% annually, over a period of 12 years, according to a Washington State University-led analysis of U.S. poison center data.

The vast majority of the attempts, more than 92%, involved other substances in addition to cannabis, and the data cannot show a direct causal link between cannabis and suicide attempts. Still, the findings are cause for concern, the researchers said, especially since the increase was more pronounced among children and women during and after the pandemic. They reported their findings in the journal JAMA Network Open.

“This study adds to already ample evidence that cannabis use, particularly by younger people, has significant implications for mental health,” said study co-author Tracy Klein, a WSU associate professor of nursing. “We don’t have evidence that cannabis alone was the primary driver of a suicide attempt, but we do know that cannabis can worsen certain mental health conditions and increase impulsivity.”

Lithium can be obtained from hot deep water

View of the laboratory: An adsorbent based on a lithium-manganese oxide with a special crystal structure serves as a lithium-ion sieve.
Photo Credit: Dr. Monika Bäuerle, IAM-ESS / KIT

Researchers at KIT and EnBW show lithium-ion sieve for geothermal soles - lithium extraction can complement electricity generation and heat supply

Geothermal energy not only enables a sustainable supply of electricity and heat, but also a regional lithium extraction. Researchers at the Karlsruhe Institute of Technology (KIT) and EnBW have produced a lithium-ion sieve from a lithium-manganese oxide and used it to adsorb lithium from geothermal brines. The use of domestic lithium sources can help to meet the increasing demand for light metal, which is indispensable as energy storage material. The researchers reported in the journal Energy Advances, who now recognizes the work as one of the "Outstanding Paper 2022". 

A sustainable energy supply requires efficient energy storage. Lithium is indispensable - the light metal is in the batteries of many technical devices and vehicles, from smartphones to notebooks to electric cars. Demand has risen sharply worldwide in recent years. Europe is still dependent on imports. However, there are also European lithium deposits, namely thermal waters a few kilometers deep. They contain high concentrations of lithium ions. In this way, geothermal plants that extract hot water from the depths can not only be used for sustainable electricity and heat supply, but also for environmentally friendly regional lithium production.

A once-stable glacier in Greenland is now rapidly disappearing

 

The K.J.V. Steenstrup Glacier during the summer melt season in 2016.
Photo Credit: NASA/John Sonntag.

As climate change causes ocean temperatures to rise, one of Greenland’s previously most stable glaciers is now retreating at an unprecedented rate, according to a new study. 

Led by researchers at The Ohio State University, a team found that between 2018 and 2021, Steenstrup Glacier in Greenland has retreated about 5 miles, thinned about 20%, doubled in the amount of ice it discharges into the ocean, and quadrupled in velocity. According to the study, such a rapid change is so extraordinary among Greenland ice formations that it now places Steenstrup in the top 10% of glaciers that contribute to the entire region’s total ice discharge.

The study was published today in Nature Communications. 

The Steenstrup Glacier is part of The Greenland Ice Sheet, a body of ice that covers nearly 80% of the world’s largest island, which is also the single largest contributor to global sea rise from the cryosphere, the portion of Earth’s ecosystem that includes all of its frozen water. While the region plays a crucial part in balancing the global climate system, the area is steadily shrinking as it sheds hundreds of billions of tons of ice each year because of global warming.

The wound dressing that can reveal infection

The wound dressing is made of tight mesh nanocellulose, preventing bacteria and other microbes from getting in. At the same time, the material lets gases and liquid through.
Photo Credit: Olof Planthaber

A nanocellulose wound dressing that can reveal early signs of infection without interfering with the healing process has been developed by researchers at Linköping University. Their study, published in Materials Today Bio, is one further step on the road to a new type of wound care.

The skin is the largest organ of the human body. A wound disrupts the normal function of the skin and can take a long time to heal, be very painful for the patient and may, in a worst-case scenario, lead to death if not treated correctly. Also, hard-to-heal wounds pose a great burden on society, representing about half of all costs in out-patient care.

In traditional wound care, dressings are changed regularly, about every two days. To check whether the wound is infected, care staff have to lift the dressing and make an assessment based on appearance and tests. This is a painful procedure that disturbs wound healing as the scab breaks repeatedly. The risk of infection also increases every time the wound is exposed.

Concordia researchers fight shallow lake algae blooms with floating filtration technique

Photo Credit: Liz Harrell

Climate change and human activity have been putting pressure on water bodies worldwide, and Canada’s vast network of lakes is no exception. Over the past decades, increasing nutrient levels have led to a process called eutrophication, in the shallow lakes dotting Quebec’s Laurentian region north of Montreal. These changes have led to a surge in algae blooms, rendering the lakes unusable and possibly disrupting the natural ecosystem.

Restoring these lakes to a healthier condition is a complicated and expensive undertaking, but a new method being investigated by Concordia researchers in the Department of Building, Civil and Environmental Engineering may cut down on both costs and labor in an environmentally friendly way.

Writing in the journal Water, the researchers describe a system of floating geotextile filters that efficiently remove suspended solids, algae and the nutrients from a shallow lake.  While the project is still in development, the researchers say they believe it has the potential to scale up. This technology could then benefit the health of larger bodies of water such as ponds, rivers, coastal areas and bays.

Nebraska-led study first to define anxiety spiraling from national election

Illustration Credit: Clint Chapman / University of Nebraska–Lincoln / University Communication

Researchers are beginning to better understand the toll of polarized politics on mental and physical health, and a new study in Journal of Elections, Public Opinion and Parties suggests that Americans’ political anxiety crescendos before a major election.

Led by University of Nebraska–Lincoln political scientist Kevin Smith, with Aaron Weinschenk of the University of Wisconsin–Green Bay and Costas Panagopoulos of Northeastern University, the study is the first to examine anxiety tethered to a specific political event — the 2020 presidential election, touted as the most consequential in recent history by both sides.

Using a two-wave panel survey measuring political anxiety, given two weeks prior and two weeks following the 2020 election, the study found that overall Americans were more anxious before the election, as researchers had hypothesized. Further, following the election, it was those who specifically voted for Donald Trump, conservatives and African Americans who reported lower levels of anxiety.

“We found a lot of political anxiety right before the election, and that the election was an intervention to treat some of that anxiety — how much, we don’t know because of some of the craziness around the election,” Smith, chair and Olson Professor in political science, said. “But, pretty much across the board, political anxiety went down following the election, and it went down surprisingly in some groups.

How does a millipede get its legs?

These microscopic images of the outside and inside of a millipede show the unexpected transparent protrusions, containing bundles of legs, present before the millipede molts. After the molt, while the millipede recovers, the legs are fully formed and become functional.
Photo Credit: © 2023 Soma Chiyoda

Millipede legs grow in an unexpected way, according to new research. Previously, it was thought that when a millipede molts (sheds its exoskeleton), it grows new segments on the end of its body without legs. Then after the next molt, the previously new segments re-emerge with fully formed legs attached. However, a team at the University of Tokyo has found that new segments actually contain tiny bundles of legs, which appear as transparent protrusions before molting and then become fully formed afterwards. This discovery could help us understand how not only millipedes, but also other arthropods (invertebrates with jointed legs) grow.

If you’ve recently been for a picnic in the park, you’ll probably have had to contend with a few creepy-crawlies. One that you might come across trundling under a shady tree is the harmless millipede. Famous for its multitude of legs (though the first to have more than 1,000 was actually only discovered in 2021), it is thought to have been one of the first creatures to walk on land and breathe air about 420 million years ago. Their lifestyle of burrowing in the dirt and digesting decomposing plant matter means that they play a very important role in our ecosystems, but there is still a lot we don’t know about them, including exactly how they get all those famous legs.

Immediate carbon cuts, common marine heatwave terminology urged

Photo Credit: Patrick Hendry

Over the past 200 years, the ocean and atmosphere have been accumulating massive amounts of carbon dioxide as factories, automobiles, airplanes and more churn out the powerful greenhouse gas. Two articles published in Nature by University of Hawaiʻi at Mānoa oceanographers provide a reality check on the limitations of carbon dioxide removal and a warning­ that marine heatwaves need clear definitions so communities can adapt.

Limitations of carbon dioxide removal

In all the scenarios assessed by the United Nations’ Intergovernmental Panel on Climate Change, nations around the world must dramatically and rapidly reduce their dependence on fossil fuels in order to limit global warming to 1.5–2 °C above pre-industrial levels. Further, the paths to limit warming also require the removal of carbon dioxide from the atmosphere, using methods that are still in the early stages of development.

David Ho, oceanography professor at the UH Mānoa School of Ocean and Earth Science and Technology (SOEST), wrote in his Nature article, “We must stop talking about deploying [carbon dioxide removal] as a solution today, when emissions remain high—as if it somehow replaces radical, immediate emission cuts. We have to shift the narrative as a matter of urgency.”

Chemists Have Developed a Guide to Oxygen Electrode Design Strategies

Structure of perovskite materials for solid oxide electrochemical devices.
Illustration Credit: Et al., Sustainable Energy Technologies and Assessments

The group of scientists created a guide to oxygen electrode design strategies for solid oxide electrochemical devices. The researchers formulated key directions for the chemical and structural design of oxygen electrodes for solid oxide fuel cells (SOFC) and solid oxide electrolysis cells (SOEC). The scientists published their work on current strategies for improving the electrochemical performance of oxygen electrodes at reduced operating temperatures in the journal Sustainable Energy Technologies and Assessments.

According to the authors of the study, the guide will be useful to scientists whose work is related to the development and design of air electrodes for electrochemical cells.

"Many of the processes in hydrogen energy technology are implemented using fuel cells and electrolysis, in which SOFCs and SOECs are involved. These electrochemical devices are very promising due to their high energy conversion efficiency and wide range of operating characteristics," explains Dmitry Medvedev, Head of the Scientific Laboratory of Hydrogen Energy at UrFU.

Breakthrough fix identified for earthquake-prone buildings

A cost-effective solution to strengthen Aotearoa New Zealand's riskiest buildings has been identified by researchers at Waipapa Taumata Rau, University of Auckland.

PhD candidate Victor Li, Dr Enrique del Rey Castillo and Dr Rick Henry from the Faculty of Engineering found that wrapping weak spots in concrete walls with carbon-fiber strips can strengthen high-rise buildings to resist earthquakes well beyond the demands of the building code.

The research was funded by Toka Tū Ake EQC to help find the most efficient and cost-effective ways to strengthen thin concrete walls.

The findings are likely to draw significant interest in the engineering sector as over 100 multi-story buildings in Wellington’s CBD alone are well below modern code.

Li says that thin concrete walls can deform out of plane due to their inherent instability, and just one percent of lateral displacement can cause catastrophic collapse.

Even as temperatures rise, this hydrogel material keeps absorbing moisture

MIT engineers have found that a common hydrogel has unique, super-soaking abilities. Even as temperatures climb, the transparent material continues to absorb moisture, and could serve to harvest water in desert regions, and passively regulate humidity in tropical climates.
Photo Credit: Felice Frankel

The vast majority of absorbent materials will lose their ability to retain water as temperatures rise. This is why our skin starts to sweat and why plants dry out in the heat. Even materials that are designed to soak up moisture, such as the silica gel packs in consumer packaging, will lose their sponge-like properties as their environment heats up.

But one material appears to uniquely resist heat’s drying effects. MIT engineers have now found that polyethylene glycol (PEG) — a hydrogel commonly used in cosmetic creams, industrial coatings, and pharmaceutical capsules — can absorb moisture from the atmosphere even as temperatures climb.

The material doubles its water absorption as temperatures climb from 25 to 50 degrees Celsius (77 to 122 degrees Fahrenheit), the team reports.

PEG’s resilience stems from a heat-triggering transformation. As its surroundings heat up, the hydrogel’s microstructure morphs from a crystal to a less organized “amorphous” phase, which enhances the material’s ability to capture water.

Teasing strange matter from the ordinary

New insights from Jefferson Lab reveal details of how strange matter forms in ordinary matter
Photo Credit: Courtesy of Jefferson Lab

In a unique analysis of experimental data, nuclear physicists have made the first-ever observations of how lambda particles, so-called “strange matter,” are produced by a specific process called semi-inclusive deep inelastic scattering (SIDIS). What’s more, these data hint that the building blocks of protons, quarks and gluons, are capable of marching through the atomic nucleus in pairs called diquarks, at least part of the time. These results come from an experiment conducted at the U.S. Department of Energy’s Thomas Jefferson National Accelerator Facility.

It’s a result that has been decades in the making. The dataset was originally collected in 2004. Lamiaa El Fassi, now an associate professor of physics at Mississippi State University and principal investigator of the work, first analyzed these data during her thesis project to earn her graduate degree on a different topic.

Nearly a decade after completing her initial research with these data, El Fassi revisited the dataset and led her group through a careful analysis to yield these unprecedented measurements. The dataset comes from experiments in Jefferson Lab’s Continuous Electron Beam Accelerator Facility (CEBAF), a DOE user facility. In the experiment, nuclear physicists tracked what happened when electrons from CEBAF scatter off the target nucleus and probe the confined quarks inside protons and neutrons. The results were recently published in Physical Review Letters.

Durable, low-cost COVID-19 vaccine could help fill in gaps around the world

A protein-based COVID-19 vaccine developed by researchers at Stanford Medicine and their colleagues may be ideal for infants.
Image Credit: Gerd Altmann

In a study led by Stanford Medicine researchers, a low-cost COVID-19 vaccine that does not require refrigeration provided immunity in rhesus monkeys for one year.

A low-cost, protein-based COVID-19 vaccine tested in rhesus monkeys by Stanford Medicine researchers and colleagues offered immunity against known variants for at least one year. Researchers hope the vaccine, which can remain unrefrigerated for up to two weeks and may be especially beneficial for infants, will help alleviate the need for boosters while improving herd immunity around the world.

If the vaccine succeeds in human trials, it could be an alternative to the mRNA vaccines widely used for COVID-19, without drawbacks such as high expense and low-temperature storage requirements. Protein-based vaccines, which use protein fragments of the target virus rather than the whole virus, have been used for decades to protect against diseases such as shingles and hepatitis.

“Our motivation was to come up with a vaccine that would provide worldwide access to vaccination,” said Peter Kim, PhD, the Virginia and D.K. Ludwig Professor in Biochemistry. “In the case of the mRNA vaccines, for example, they are expensive, difficult to make and require storage in freezers. So, we wanted to solve those problems with this vaccine.”

Study shows how machine learning can identify social grooming behavior from acceleration signals in wild baboons

Photo Credit: Charl Durand

Scientists from Swansea University and the University of Cape Town have tracked social grooming behavior in wild baboons using collar-mounted accelerometers.

The study, published in the journal Royal Society Open Science, is the first to successfully calculate grooming budgets using this method, which opens a whole avenue of future research directions.

Using collars containing accelerometers built at Swansea University, the team recorded the activities of baboons in Cape Town, South Africa, identifying and quantifying general activities such as resting, walking, foraging and running, and also the giving and receiving of grooming.

A supervised machine learning algorithm was trained on acceleration data matched to baboon video recordings and successfully recognized the giving and receiving grooming with high overall accuracy.

The team then applied their machine learning model to acceleration data collected from 12 baboons to quantify grooming and other behaviors continuously throughout the day and night-time.